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首页> 外文期刊>Journal of great lakes research >Direct observations of fish incapacitation rates at a large electrical fish barrier in the Chicago Sanitary and Ship Canal
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Direct observations of fish incapacitation rates at a large electrical fish barrier in the Chicago Sanitary and Ship Canal

机译：在芝加哥卫生和船舶运河的大型电子鱼屏障处直接观察鱼的失能率

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The electric barrier system in the Chicago Sanitary and Ship Canal was designed to eliminate interbasin transfer of aquatic nuisance species between the Mississippi River and Great Lakes Basins. Electrical output was recently increased in an effort to more effectively eliminate the upstream migration of bighead carp (Hypophthalmichthys nobilis) and silver carp (Hypophthalmichthys molitrix). Using gizzard shad (Dorosoma cepedianum) as a surrogate species, we examined the effectiveness of the barrier at incapacitating fish by placing them in a non-conductive cage and transporting the fish through the barrier. This experiment was conducted before and after changes in operating parameters. Higher electrical output increased barrier effectiveness by decreasing the distance required to incapacitation. Overall, 97% and 100% of fish became incapacitated at the lower and higher electrical operating parameters, respectively. Fish were incapacitated the soonest during the winter and spring, which was likely influenced by the reduced movement activity in the cooler months and the larger fish available for testing later in the spring. Moreover, effectiveness was influenced by type of boat hull material used during testing. Fish that were transported through the barrier along an aluminum-hull boat were able to swim nearly twice the distance into the barrier as those transported with a fiberglass-hull boat during the summer. The delayed incapacitations along the aluminum boat were presumably due to distortion of the electrical field caused by the conductive hull. These results raise concerns regarding the effect that metal-hull barges might have on the effectiveness of the barrier during navigation. Published by Elsevier B.V. on behalf of International Association for Great Lakes Research.
机译：芝加哥卫生和船舶运河的电子屏障系统旨在消除密西西比河与大湖流域之间的水生扰动物种的跨流域转移。最近增加了电力输出，以更有效地消除big鱼（Hypophthalmichthys nobilis）和silver鱼（Hypophthalmichthys molitrix）的上游迁移。我们使用g（Dorosoma cepedianum）作为替代物种，通过将障碍物置于不导电的笼子中并通过障碍物运输来检查障碍物对丧失能力的鱼的有效性。该实验是在操作参数改变之前和之后进行的。更高的电输出通过缩短失能所需的距离来提高隔离效果。总体而言，在较低和较高的电气操作参数下，分别有97％和100％的鱼失去工作能力。鱼在冬季和春季最快丧失能力，这可能是由于在较凉的月份运动活动减少和较大的鱼可在春季晚些时候进行测试而造成的。此外，有效性受测试期间使用的船体材料类型的影响。沿着铝壳船通过障碍物运输的鱼在夏天可以游到障碍物中的距离几乎是两倍，是用玻璃纤维船体运输的鱼。铝船沿途的失能可能是由于导电船体引起的电场畸变。这些结果引起人们对金属船体驳船在航行期间可能对障碍物有效性产生影响的担忧。由Elsevier B.V.代表国际大湖研究协会出版。

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